Backup or archive: what’s the difference?

the words ‘backup’ and ‘archiving’ are often used interchangeably, as though they refer to the same thing. you have probably done this if you’re not acquainted with the technicalities of storage technology.  

they aren’t the same thing. and the differences between them are so important that a company could lose a huge amount of its resources if it handles its it without this knowledge.

but how are these terms different?

in order to answer this question, we should understand what backup and archives are.